Cant barking machine



E. l. FLA'YrEBoE E-r Al. 2,263,036

CANT BARKING MACHINE Nov. 1s, 1941.

Filed Sept. 6, 1938 8 Sheets-Sheet l INVENTOR- e FZATEoE C. /665 f wwwATTORNEY JJ mi] w imi, l@

rmi N NOV. 18, 19,41*.- E L FLATEBQE ET AL 2,263,036

CANT BARKING MACHINE Filed Sept. 6, 1958 8 Sheets-Shea*l 3 yV/L @wwwATTORNEY Nov. 18, 1941.4 E ,.-LATEBE ETAL 2,263,036

V CANT BARKING MACHINE Filed sept. e, 1938' s Smeets-sheet 4 vENToR E/.e .FLArfoE Lm C 51665 BY ATToRNEYa Nov. 18, 1941. E; l. FLATEBOE ETALCANT ARKING MACHINE Filed sept. e, 1958 Y s sheets-sheet 5 NH2 l.LAT/5601s m ILL/4M C 6766s vf) BY ATTORNEY N0v 18, 1941-y FLATEBOE ETAL2,263,036A

CANT BARKING MACHINE 8 Sheets-Sheet 6 Ws RWM v`W n mr. A u mun mmm n fuW m m Nov. 18, 1941. E. l. FLATEBE TAL CANT BARKING MACHINE Fled sept.6. 1938 I 8 sheets-sheet 'l NOV- 18, 1941- E. l. FLATEBOE ET-I CANTBARKING MACHINE Filed Sept. 6, 1938 V8 Sheets-Sheet 8 ENTOR A T5605 HAr. -L

WmAT'roRNEYs M31. WQ

)NQ e www Patented Nov. 18, 1941 K CANT BARKING MACHINE ,L j l YEinar'l. Flateboeana william clinton Briggs, .g if l f Everett, Wash. f

Application Septemberv, 1938, Serial No.'e228,15`98` l z'oimmis.V (o1.14492081 This invention relatesjto machines for the barking andcleaning'of wood slabs, cantsand blocks preparatory to their being usedin the making of pulp for the manufacture of paper.l f

More particularly, the l, invention relates to those types ofmachinesgenerally referredto in the pulp wood industry as barkers;; thepresent machine being designed especially for `the vremoval ofbark,pitchseams and pockets,'stained portions and various other defectiveareas that might be found in vwood slabs, cants or blocks as preparedfor the-making of pulp as used in thev manufacture of paper.

EXDlanatoryto the present invention, it will herebe lstatedthat inthelmaking `oflpulp from wood,y particularlyv that which is to `be usedin the manufactureofpaperof the better grades', yit

.is extremely desirable that the vwood to be used be-entrely free of allbark, stained or rotted poritions, pitch and all discoloredand defectiveareas that are detrimental tojvthe appearance of the paper in `itsfinished state. f In order that nofsuch defective parts of thefwoodshall appearin Athe pulp, it is necessarythat each piece of Wood,`be

`fore being ground or divided, .be inspectedand that all defective partsthereof be removed. Heretofore, various mechanical devices have beenemployed for doir1g a"material amount of this ,l work,but because of thecharacter or construction of `such machines,` their use has been more orless limited to roughingoi operations, and it is still required that a`considerable amountk of the work ofcleaning thepieces be `doneby hand.Such manual orlhand work `isslow and is difficult, especially when thepieces of wood worked on arel large and heavy. Furthermore; hand `Workis relatively expensive as comparedjto the mechanical operation,` andmanifestly mechanical fbarking or cleaningis preferred, provided it willtake -care ofthe maximum amount of the Work. l, 4 p r It is thegeneral'ckase that barkingmachines vas heretofore employed have providedmeans `whereby the pieceo'f Wood tov be cleaned is supported andfaxiallyrotated to present thesurfaces that are to bepleanedA to a barking'tool,and usually the tool hasrloeen mounted for move- Ament along thepieoe."Also, boring `machines of various kindshave beenfemployed fortherernoval yof knots, `buttoour knowledge, previously employed machineshave provided that the piece be held substantially stationarywhile therouting, barking or boringtool is swung to `different vpositionsalongthe length of the piece, and we are not aware of any machine in whichthe tool f boring.` Itis our belief that the above mentioned types ofmachines now generally in use are not as`economical, nor as practical,`especially for the handling of large pieces, as 'would beamachinewherein theftool'used is designed" for bothrouting *and boringoperations and wherein `the piece to be operated on is universallymovable with respect'to the tool,and the tool, while adjustable to someextent, is substantially stationary while inuse.," `f y lnview-oftheab've,"it has been the principalobject,` of this'invention to provide amachine that` is capableofhandling relatively large and heavy pieces 'ofwood, and wherein the removal of defects iseffe'dted'by airelativelystationary toolof novell character, designed bothfor boring andforrouting and Wh'ereinthe support for thepiece being worked upon ismovableV both longitudinally and transverselyof the piece and alsoprovides for its rotationj thus to provide for presentinganyselected-"portion or area of the piece toi the tool for removal ofwhatever defect adjustablesupport for van electrically driven arbor ,onwhich thereis fixed aj combined routingr and boring too l, and adjacentwhichl tool is a track on which is mounted a horizontally movajbleVcarriagereduipped with means in the form of chucking headsor clamps`formounting and sup.-

`porting a slab `drfleant of 'wood horizontally therein for `rotation,While lateral movement relative to the tool,lis` providedinthe lateralshiftinglof the clamps so thatthe rrouter head or the boring toolmaybecaused to `contact any desired area of the piece for cleaning it ofwhatever defectit may contain.- y

Other objects of'the invention reside in the provision `of novelmechanical means for raising acant or slab in the machine to clampingposition, and whereby, when released from the clamps, the piece maybedischarged `laterally from` the niac'hine, I f

VStill `further objects of the invention reside in the specific detailsof construction of the combined router and boring tool, also in thoseparts of the machine whereby the movement of the piece being worked uponis controlled.

Various other objects reside in the details of construction and in thecombination of -parts associated with or forming a part of the movablecarriage, and in their relationship and mode of operation for theaccurate and expeditious handling of the piece being worked upon.

In accomplishing these and other objects of the invention, we haveprovided the improved details of construction, the preferred forms ofwhich are illustrated in the accompanying drawings, wherein- Fig. 1 is aside elevation of a machine embodying the present invention.

Fig. 2 is a plan view of the same.

Fig. 3 is an end elevation of the machine and illustrating, in dottedlines, the lower limit of vertical adjustment of the routing and boringtool and lateral travel of the cant.

Fig. 4 is an end view of the router and drill.

Fig. 5 is an axial section of the router and drill on line 5-5 in Fig.4.

Fig. 6 is a vertical section through the tool supporting column andcarriage, substantially on line 6-46 in Fig. 2. y

Fig. 7 is a horizontal section on the line 'I-1 in Fig. 6.

Fig. 8 is a longitudinal, sectional view of the carriage and clampingdevices for supporting the slab or cant, as seen on line 8-8 in Fig. 2.

Fig. 9 is a sectional detail on line 9-9 in Fig. 1.

Fig. 10 is a plan view of the carriage, and particularly illustratingthe means for lateral adjustment of the clamping devices.

Fig. 11 is a vertical section on line II-II in Fig. 10.

Fig. 12 is a detail illustrating vthe cant lifting and dischargemechanism.

Fig. 13 is an end view of the same.

Fig. 14 is a diagrammatic illustration of the hydraulic system employed.

Referring more in detail to the drawings- The router head, presently tobe described in detail, is designated in its entirety by referencenumeral I, and is coaxially fixed upon one end of a horizontallydisposed shaft, or arbor 2, eX- tending from a supporting housing 3,which is xedly mounted on the upper end of a vertically disposed tubularcolumn 4. The column 4, in turn, is slidably fitted for vertical,telescopic travel in a tubular supporting standard 5 that is xed to abase plate `Ii resting upon and xed tothe foundation or floor 1 uponwhich the machine is disposed.

As will be observed best by reference to Fig. 6, the arbor, or shaft, 2is rotatably mounted in the housing 3 by means of anti-frictionbearings, designated by reference numerals 8 and 8a, and it is equippedat that end opposite the end carrying the router head, with a drivingpulley wheel 9. The wheel 9 is alined with a drive pulley wheel IIJfixed on the shaft IIa of an electric motor II. Both pulley wheels, 9and I0, Iare grooved to accommodate a plurality of V-belts, designatedat I2, whereby the driving connection between the motor and the arbor 2is effectively completed.

The electric motor II is xedly mounted upon a horizontal table, or base,I3', that is formed as a part of a cap I3 on the column 4 which mountsthe housing 3, and thus the motor and router head will move upwardly ordownwardly in accordance with the vertical adjustment of the column 4.

Referring more particularly to Fig. 6, it will be observed that thecolumn 4 is held against rotation in the standard 5 by means of alongitudinal key I4 that is fixed to and extends the length of thecolumn and is tted for movement in a keyway I4 provided in the standardwall. The column is adapted to be vertically adjusted and to be held atany of its different positions of adjustment by a hydrauliclift-mechanism comprising a hydraulic cylinder I5 that is containedcoaxially within the standard 5 and which rests at its lower end againstthe base plate 3. Reciprocally tted in the cylinder is a piston 20having extending upwardly therefrom and through a packed gland 22 in theupper end head 23 of the cylinder. At its upper end, the piston rod isthreaded onto a fitting 25 which is fixed by a cross bolt, or pin, 26 tothe cap I3 on the upper end of the column 4.

To actuate the piston upwardly or downwardly within the cylinder I5, andthus effect a corresponding adjustment of the column, and also to holdthe column against movement when at any definite position of adjustment,we utilize a hydraulic medium under pressure. This medium is admittedinto or from the lower end of the cylinder through a pipe connection 21and a channel 21' in the cylinder wall, and it is likewise admitted intoor from the upper end of the cylinder through a pipe connection 28 and achannel 28. rIhe pipes 2'I and 28 are adapted to be selectivelyconnected with a source of pressure medium, through the adjustment of `afourway valve, as designated at 29; this valve having a connection 29a.with a source of supply of pressure medium indicated by the pipe 39 inFig. 14 and a connection 29hy with an exhaust pipe 3|. The valve controlis such that the pressure medium, preferably city water, can be appliedto either end of the cylinder while exhausted from the other end, thusto adjust the column 4 to a desired height. It is understood also thatwhen the valve 29 is closed, the piston will be locked against movementin either an upward or downward direction, and the router head I willthen be held at a fixed position with reference to its up or down limitsof travel.

As will be observed by reference to Figs. 3 and 6, the router head I isdisposed at one side of the supporting column. Also, it will be notedthat at that same side of the column, and extending in a direction at aright angle to the direction of the axis of the router, is a track onwhich a carriage 32 is mounted for back and forth travel. The trackcomprises two parallel, spaced rails 33-33' that are xed in the samehorizontal plane on a base frame structure 34. This structure, in turn,rests upon and is fixed to a foundation structure 34a that may be builtup to any suitable or necessary height, as determined by the limits ofadjustment of the router head.

The frame structure 34 is rectangular and of rigid I-beam construction,comprising longitudinal side beams and cross beams 34' that join thelongitudinal beams at opposite ends of the frame, and at spacedintervals between its ends; this structure being somewhat longer thanthe wheel base of the carriage and supports the track rails thereon, andthese rails are suciently long that the carriage will have travel, backand forth lengthwise of the track, a distance that is somewhat longerthan the cants that are to be worked on in the machine.

,. ,The moyement ofthe carriage toA various positions along ,the track,,and the holding of the carriage at diierent'positions of adjustment isefcomprises a hydraulic cylinder S-of substantial length,` fixed 'on theframe structure 34 lengthwise thereof. In thecylinder is apiston 36having a rod 31 extending from the cylinder `and-ccnnected `by a pin 38with `,a bracket 39,1xed to and depending from the bed Vof the carriageas obseryedin Figs. land 8.

f Hydraulic pressurewmediumis administered through afour-way controlvalve 40 to and from the'opposite ends of the 'cylinder 35 through pipes4|; and 42,; thel valve :being connected lwith the `source of supply 30through pipeila, and with theexhaust 3| .through pipe 4Gb. 'Thearrangement provides for admitting'the pressure medium into either :endof-the cylinder and :allowing it to discharge; from the other end.accordingly `to cause the piston to be moved andthus to eiect l thedesired travel ofthe carriage. This adjustment 'may beheld secure byclosing .the valve against-inlet or outlet of the hydraulic 'medium fromthecyIinder., v

Fixed upon the. carriage 32, symmetrically fspaced from thetransversemedial line, are cross guides,` orV Ways, I511--' in which aremounted frame 52, which we will refer to as the clamping base. This base`is inthe -nature of an elongated, rectangular structure formed ofchannel iron beams, and i-t extends in adirection lengthwise of thetrack, andoverlying the cross ways 5|l--5llf Erected upon the base 52,at its opposite ends,

are chucking clamps 53` and 54, designated for` the support of the-oppositeends of the cant, or

slab that is` to be worked upon. 'The clamp 53 is `fixed coaxia'llyon ;aturning shaft 55 *that is revolubly mountedl to a head bracket, orhousing, `56, that is boltedl to the base 52'. The clamp 54 is likewisefixed on f the end of a supporting shaft 51 that is revolubly containedin the tail bracket "orhousing 58 that is mounted on the base 52 forAadjustment longitudinally thereof, thus toadjust the spacing of theclamps or chucks for the accommodation of slabs, cants or logsof'diiferent lengths. Each of the vc1amps,or 'what might be calledchucking heads"has a center point 60' and radial lugs 6| for enteringthe end of a cant or slabfto xedly support it for rotation. f Theadjustment of the tail bracket or housing `58, that `is `necessary for:the mounting and for fthe releasing of a slab or cant, is elTected ,by

Ameans of a hydraulic mechanism which is best disclosed in Fig., 8. Thiscomprises a hydraulic cylinder thatis fixed within the base 52,by i`meansof the cross bars 66. The cylinder is so `fected by a hydrauliccylinder mechanism which only necessary to move the chucking head 54away from the head 53, and this .is .likewise `effected by theapplication .of pressure medium into the cylinder. While itis not hereinillustrated, it "is contemplated that the 'flexible tubes 1| :and "|2will be` `carried on .reels and will wind onto `or unwind therefromautomatically :as necessary .for ftravel of the movable clamp. Otherconnections, `between the source of pressure medium and `.mov-

` able cylinders may be likeWiSearranged.

When a cant is `mounted by the ,clamps or chucking heads, .it mayberotatably adjusted `by rotating the-supporting `shaft 55 which .mountsthe clamp 53. For this purpose, the shaft 55 :is

, equippedv at its outer end with a relatively large worm gear 15 thatoperates in mesh witha worm 16 mounted on a cross shaft 11. ,The `shaft1-1 is rotatably contained in ahousing 18 `that is fixed to the head:bracket `56. Fixed on one 'end of the shaft is a. sprocket wheel `8|)'and this is alined with a smaller .sprocket wheel 8| iixed on the endof the vshaft 82 of `an electric motor 83; the motor being mounted onthe under side l of the frame 52, as will be observed by reference toFigs. 1 and 8. A sprocket chain belt 85 `operates about thesprocketwheels 8l) 'and'Bl for `driv- 4ing the worm shaft thus throughthe 'wo-rm ,gear 'l5 and shaft 55 to rotatably adjust the supported cantas a means of bringing `a selected or ldesignated part into position forbeing `worked on by the router head I. l With a -cant `:mounted in theclamps, as noted lin Fig. 1, its movement a longitudinal direc- "tionfor presentingselected parts toposition for being worked 'onby therouter, is effected by the travelof the carriage 32 along 'thesupporting track, butin orderthat the cant, or piece being worked on,-may be shifted laterallyftoward or away from the router head, provisionis made L,for bodily shifting the clampingbase `frame 52 laterally onthe carriage 32'. l For this purpose,

me supports `or slides 5| sr'` whiehmountthe base 52 are 'slidably fixedin the `guideways '5U- 50" and mechanical means .is` provided foreffecting a quick and definite adjustment of the base 52 mounted as toextend i-n a direction lengthwise of the `frame and it reciprocallycontains a piston 61 having. a rod 68 extending from the cylinder andvconnected at its end by a pin or Ibolt 69 to a base .lug 10 on the tailhousing 58. i v,Admittance of a pressure medium into and from theopposite ends of the vhydraulic cylinder |55` is provided for throughthe mediacy of flexible tubes 1| and 12 which are connected through acontrol valve 13 with the source of supply of pressure medium 30 by thepipe 13a, and with Vthe exhaust `pipe 3| by a pipe 13b. Manipulation ofthe valve provides for admitting the pressure medium into either end ofthe cylinder to move the piston accordingly. f

. either toward or from the router, whenever such is desired.

The mechanism foreifectingthis lateral adjustment of base 52 `is best'shown in Figs. r6, 8, `10

and 1l, and 'it `comprises a relatively short hydraulic cylinder 188disposed horizontally of and i rigidly mounted in the carriagebedlengthwise i vWhen a cant is to be placed between the clamps, thelatter are then spaced sufciently thereof. This cylinder `is equipped'with a piston having a piston rod 8| `extended therefrom .and connectedat its end to la rack bar 82 `that is slid-ably contained in a guideway93. The 'rack bar operatively vmeshes with a pinion gear 94 iixed on atransversely directed shaft mounted in bearings 96 carried in `thecarriage bed. This Ashaft also is equipped with a miter gear 9"! thatoperatively meshes with a miter gear 91" vfixed on a shaft 98 thatextends longitudinally of and in the central line of the carriage and isrotatable in supporting bearings 99-99 fixed in the carriage bed nearits opposite ends. Fixed on the opposite ends of the longitudinal`shaft98 are gearwheels IDU-'|00'. which, respectively, mesh withr racksurfaces IllI--IIII' that arel formed in the under vsurfaces ofA theslides |-5|'V whereby the clamping chucking base 52 is mounted.

It'will be understood by reference to Fig. l0 that movement of thepiston 90 in the cylinder .88 will effect a similar movement of the rackbar `32,*and this will cause the rotation of shaft S5 and this rotarymotion will be transmitted through 'the4 miter gears. 91-01 to shaft 98.Since shaft 98 is rotatably fixed in the carriage, its rotation willeffect a transverse adjustment of the clamping base 52 to an extent anddirection `dependentupon the extent and direction of travel of thepiston 90 in its cylinder. The movement of the piston 90 iscontrolledand effected by the application of hydraulic pressure mediuminto the cylinder 88 and this is effected through pipe connections asdiagrammatically illustrated in Fig. 14, wherein-|02 and |03respectively designate pipes that lead from a four-way valve |04 toopposite ends of the cylinder; parts of these pipes `being flexiblek topermit the easy movement; Valve |04 has a" connection |04a with thesource of supply 30 of pressure medium and has a discharge pipe |041).

I Since the present machine is designed for the handling of cants orwood pieces of considerable weight as well as large size, itis desirablethat mechanical means be provided for lifting them into clampingposition and for subsequently discharging them from the machine. Forthis rst mentioned purpose, there is provided a pair of loading orlifting' rolls ||0||0, as noted best in Figs. 1, 8 and 12. These rollsare disposed just above and transversely of the clamping base 52 betweenthe chucks or clamps 53 and 54'and each roll is mounted between theouter ends of a pair of arms III-l I I. These pairs of arms are xed,respectively, on parallel cross shafts ||2 ||2 that are rotatablymounted on the clamping base 52, at a point substantially medial 'of theclamps, in bearings ||4 which also are fixed to base 52. Correspondingends of the cross shafts are equipped with intermeshing gears ||5-| I5'of like size, and on one of the shafts, at the end opposite the gears, alever arm ||6 is fixed whereby that shaft may be rotatably actuated ineither direction to `effect a synchronous rotative action in theopposite direction of the other shaft, thus, by the rotation, to causethe paired arms to be oscillated for raising or for lowering the rolls I|0| I0 in unison.

Normally, "the rolls are disposed closely adjacent the-top surface ofthe base 52, and substantially below the axial line of the chucks orclamps. In this position, a slab or cant may be loaded thereon, and in-a position lengthwise of the clamping base that,fby swinging the armsvupwardly, the cant may be lifted to and held properly in positionbetween the two clamps or chucks 53 and 54 for being clamped in placethereby.

rFor the purpose of mechanically actuating the lever arm I I6, there isprovided a hydraulic mechanism as noted in Figs. 12 and 13, comprising ahydraulic cylinder |20, fitted with a piston I 2| having a piston rod|22 that, for a purpose presently explained, extends from both ends ofthe cylinder. At one end, the rod |22 is pivotally connected by a pin|23 with a link |24 which has a lost motion connection, provided throughthe medium of a pin and slot designated at |25-I26, with the lever arm II6. Thus, when the piston is caused to be moved to its limit towardthatvend of the cylinder, the connection provides thatrthe rollers willbe actuated upwardly and lift the cant into position for beingoperatively engaged and supported by the chucking heads or clamps.

When a cant is released from the clamps or chucks, it will be lowered bythe rollers I |0-I I0' to rest with its opposite end portions supportedrespectively on a pair of transverse cross bars |29 and |29. These barshave ends fixed to a shaft |30 that extends lengthwise on the frame 52for rotation in bearings |3|-|3|. On one end of this shaft is a bevelgear Wheel |32 in mesh'with a bevel gear |33 fixed on a cross Vshaft|34, revoluble in bearings 35. On one end of the shaft |34 is a leverarm |35, which has an actuating connection with the adjacent end ofpiston rod |22. This connection comprises a link |31 which is pivotallyconnected to piston rod |22 by a pin |38 and has a pin and slot |39 and|40 providing a lost motion connection with the arm.

With this above described connection, travel of the piston rod to itsextreme'in the direction of arm |36 causes rotation of shaft |30nwhereby to swing the arms |20 upwardly, thereby to skid the cant fromthe frame to the side of the machine, Where it may be received into acar or conveyor.

The hydraulic cylinder |20 is connected in the hydraulic system, as seenin Fig. 14, through the mediacy of a four-way valve having flexibleconnections |46 and |41 leading to the opposite ends of the cylinder anda connection 45a to the supply 30 and a connection |45b with the exhaust3|.

By reference to Fig. 14, it will be seen that the motor has circuitwires|50 and |5| leading to a switch box |52, into which lead the'power lines|54 and |55. Start and stop press buttons |56 and |51 control theclosing and opening of the circuit to the motor. Also, itvvill be seenthat the motor 83 has circuit lines |58 and |59 leading to a switch box|60, into which lead the power lines ISI and |62. Likewise start andstop pres's buttons I 53 and |64 control the opening and closing of thecircuit to the motor 83.

,The router, best illustrated in Figs. 4 and 5, comprises a head oftruncated, conical form, mounted coaxially on the shaft 2.v The head isdrilled to receive the shaft 2 and the latter is formed with a shoulder|66 against which the head abuts. The shaft end comprises a threadedportion 2a connected tothe head |65 in such manner that rotation of theshafttightens the connection.

It will be noticed that this head |65 comprises the tapered body |65a,and this is formed about the larger end with an encircling collarportion |6522. Formed in the body, parallel with the axis, and atequally spaced intervals, are slots |61a in which knives or cutters |61are mounted; these being held in their respective slots by set screws inthe conventional manner, and since the details of this mounting arestandard practise and not claimed as a part of the invention, adetaileddescription is dispensed with.

Likewise, there are mounted in the collar portion |65?) of the head |65,a plurality of knives or cutters |68, these being held in theirrespective slots |68a in the conventional manner. The knives or cutters|61 and |68 are inclined in the direction of rotation of the head |65,as observed by reference to Fig. 4.

Fixed coaxially within the end of the head is a drill |10 of a diametersuitable for the Work to be done.

Assuming the machine to be so constructed, its use'and mode of operationis as follows:

A block, slab or cant of wood is skidded or lifted to loading positionby any suitable means; this position being one of rest on the pairedarms |29 and across the rolls ||0| I0'.

By an operation of the valve |45, pressure medium is caused to act onpiston |2| in the cylinder I 20 to move it toward theleft, as shown inFig. l2, thereby causing the lever ||6 to beV oscillated also in thatdirection. The shaft ||2 is thus rotated and, through the gears I |5|l5', the shaft ||2 is also caused to rotate, thereby causing the arms toraise in unison to the position as shown in dotted outline in Fig. 12.By careful operation of the valve |45, the cant of wood may beaccurately centered between the chucking heads 53 and 54.

It is to be understood that, during this loading operation, movement ofthe link |31 is not such that it will operate the lever |36, because,with the piston traveling in the direction stated, the slot |40 permitsthe link to slide on the pin |39.

After the cant has been lifted to position, the valve 'I3 is operated toadmit pressure medium into the cylinder 65 to cause piston 61 to movethe head bracket 58 toward the block of wood to clamp it in position foroperation thereon. Then by a releasing operation of the valve |45,

the piston |2| will be returned to a central position in the cylinder|20, and the arms |||I returned by gravity to their lowered positions.

Through the movement of the piston 30 in hydraulic cylinder 35, effectedby manipulation of the valve 40, any longitudinal adjustment 1.

necessary to locate a defective spot in the block or cant in line withthe router I may be accomplished. Likewise, any lateral motion oradjustment toward or from the router may be accomplished through theactuation of the piston 90 within the cylinder 88 through manipulationof the valve |04. However, the normal position of the router head I isat its raised limit, and it is brought into operating position bylowering it, and this is accomplished through the mediacy of cylinder |5and the piston 20 therein under control of the valve 29. The electricmotor is energized incident to closing a circuit by pressing the startpress button on the switch box |52.

With one side ofthe block or cant prepared, f

pressure medium to the cylinder 83, and that these two movements mightbe carried on simultaneously, along with an up or down movement of therouter head at the same time.

When the `bark has been removed and the defects routed out, and it isdesired to remove the block from the machine, the arms I I are lifted,bringing the rollers II-I I0" in c ontact therewith and the clampsreleased by operating the piston 36 within the cylinder 35 toward theleft as seen in Fig. 8, so as to move the clamping head 58 away from theblock.

Then, by applying pressure in the cylinder |20, the piston |2| will beactuated to the right, as seen in Fig. 12, the block lowered and broughtto rest on the arms IZB-|29. Then, by operating this piston |20 ontoward the right, the slot |26 in the link |24 slides on the pin |25,and the link |31 operates the lever |36 so as to rotate the shaft |34.The bevel gear |33 on this shaft |34, meshing with the bevel gear |32 onthe shaft |30, causes the shaft |30 to be rotated, lifting the crossbars l29-l29' to the dotted position in Fig. 13, so that the block willbe skidded therefrom into a truck or conveyor.

This machine may be embodied in various forms of construction withoutdeparting from thespirit of the invention. Therefore it is intended thatthe appended claims be given an interpretation commensurate with theinvention herein disclosed.

Having thus described our invention, what we claim as new therein anddesire to secure by Letters Patent is- 1. Ina machine of the characterdescribed, the combination of a driven wood working tool, a movableframe, and a pair of clamps on the frame for engaging the ends of a cantto support it for operation thereon by the tool, pf a pair of rollsarranged below the cant and adjacent its opposite ends, arms supportingsaid rolls, means operatively connecting the arms for oscillation inunison for lifting to or lowering a cant from the clamps, a pair oflever arms disposed transversely of and beneath the opposite endportions of the cant to receive the latter thereon when released fromthe clamps, and means operable in connection with the means for loweringthe cant for actuating the arms to an inclined position to skid the cantfrom the frame.

2. A machine as recited in claim 1 wherein the actuating means for therolls and lever arms comprises a hydraulic cylinder, a piston and apiston rod extended from opposite ends of the cylinder and havingoperative connection at its opposite ends with the rolls and lever arms,and

means for controlling the direction and extent of activation of thepiston to selectively actuate the rolls or lever arms.

EINAR I. FLATEBOE. WILLIAM CLINTON BRIGGS.

